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new env protocol; visit/x passes R7RS tests

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ESL 2024-05-28 17:40:54 -04:00
parent 715d633ad0
commit 00bc579327
2 changed files with 150 additions and 134 deletions
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97
src/t.scm
View file

@ -190,7 +190,8 @@
; Macro transformer (from Scheme to Scheme Core) derived from Al Petrofsky's EIOD 1.17
;---------------------------------------------------------------------------------------------
; An environment is a procedure that accepts any identifier and returns a denotation.
; An environment is a procedure that accepts any identifier and access type and returns a
; denotation. Access type is one of these symbols: ref, set!, define, define-syntax.
; The denotation of an identifier is its macro location, which is a cell storing the
; identifier's current syntactic value. Location's value can be changed later.
@ -225,15 +226,23 @@
; containing either a <special> or a <core> value. In normal case, <core> value is (ref <gid>),
; where <gid> is a key in run-time store, aka *globals*. Environments should allocate new locations
; as needed, so every identifier gets mapped to one. Expand-time environments are represented as
; one-argument procedures.
; two-argument procedures, where the second argument is an access type symbol.
(define (extend-xenv env id bnd) (lambda (i) (if (eq? id i) bnd (env i))))
(define (extend-xenv-local id val env)
(let ([loc (make-location val)])
(lambda (i at)
(if (eq? id i)
(case at [(ref set!) loc] [else #f])
(env i at)))))
(define (add-location key val env) ; adds as-is
(extend-xenv env key (make-location val)))
(define (add-local-var id gid env)
(extend-xenv-local id (list 'ref gid) env))
(define (add-var var val env) ; adds renamed var as <core>
(extend-xenv env var (make-location (list 'ref val))))
(define (xenv-lookup env id at)
(or (env id at)
(error* "transformer: invalid identifier access" (list id at))))
(define (xenv-ref env id) (xenv-lookup env id 'ref))
(define (xform-sexp->datum sexp)
(let conv ([sexp sexp])
@ -290,7 +299,7 @@
(xform-call hval tail env)))]))]))
(define (xform-ref id env)
(let ([den (env id)])
(let ([den (xenv-ref env id)])
(cond [(eq? (location-val den) '...) (x-error "improper use of ...")]
[else (location-val den)])))
@ -301,7 +310,7 @@
(define (xform-set! tail env)
(if (and (list2? tail) (id? (car tail)))
(let ([den (env (car tail))] [xexp (xform #f (cadr tail) env)])
(let ([den (xenv-lookup env (car tail) 'set!)] [xexp (xform #f (cadr tail) env)])
(cond [(location-special? den) (location-set-val! den xexp) '(begin)]
[else (let ([val (location-val den)])
(if (eq? (car val) 'ref)
@ -311,7 +320,7 @@
(define (xform-set& tail env)
(if (list1? tail)
(let ([den (env (car tail))])
(let ([den (xenv-lookup env (car tail) 'set!)])
(cond [(location-special? den) (x-error "set& of a non-variable")]
[else (let ([val (location-val den)])
(if (eq? (car val) 'ref)
@ -354,12 +363,12 @@
(let loop ([vars (car tail)] [ienv env] [ipars '()])
(cond [(pair? vars)
(let* ([var (car vars)] [nvar (gensym (id->sym var))])
(loop (cdr vars) (add-var var nvar ienv) (cons nvar ipars)))]
(loop (cdr vars) (add-local-var var nvar ienv) (cons nvar ipars)))]
[(null? vars)
(list 'lambda (reverse ipars) (xform-body (cdr tail) ienv))]
[else ; improper
(let* ([var vars] [nvar (gensym (id->sym var))]
[ienv (add-var var nvar ienv)])
[ienv (add-local-var var nvar ienv)])
(list 'lambda (append (reverse ipars) nvar)
(xform-body (cdr tail) ienv)))]))
(x-error "improper lambda body" (cons 'lambda tail))))
@ -383,7 +392,7 @@
(if (and (list2+? tail) (id? (car tail)))
(let* ([var (car tail)] [nvar (gensym (id->sym var))])
(list 'letcc nvar
(xform-body (cdr tail) (add-var var nvar env))))
(xform-body (cdr tail) (add-local-var var nvar env))))
(x-error "improper letcc form" (cons 'letcc tail))))
(define (xform-withcc tail env)
@ -416,18 +425,18 @@
(loop env (cons #f ids) (cons init inits) (cons #f nids) rest))]
[(and (list2? tail) (id? (car tail)))
(let* ([id (car tail)] [init (cadr tail)]
[nid (gensym (id->sym id))] [env (add-var id nid env)])
[nid (gensym (id->sym id))] [env (add-local-var id nid env)])
(loop env (cons id ids) (cons init inits) (cons nid nids) rest))]
[(and (list2+? tail) (pair? (car tail)) (id? (caar tail)) (idslist? (cdar tail)))
(let* ([id (caar tail)] [lambda-id (new-id 'lambda (make-location 'lambda))]
[init (cons lambda-id (cons (cdar tail) (cdr tail)))]
[nid (gensym (id->sym id))] [env (add-var id nid env)])
[nid (gensym (id->sym id))] [env (add-local-var id nid env)])
(loop env (cons id ids) (cons init inits) (cons nid nids) rest))]
[else (x-error "improper define form" first)])]
[(define-syntax) ; internal
(if (and (list2? tail) (id? (car tail)))
(let* ([id (car tail)] [init (cadr tail)]
[env (add-location id '(undefined) env)])
[env (extend-xenv-local id '(undefined) env)])
(loop env (cons id ids) (cons init inits) (cons #t nids) rest))
(x-error "improper define-syntax form" first))]
[else
@ -452,7 +461,7 @@
(cons (xform-set! (list (car ids) (car inits)) env) sets)
(cons (car nids) lids))]
[else ; define-syntax
(location-set-val! (env (car ids)) (xform #t (car inits) env))
(location-set-val! (xenv-lookup env (car ids) 'set!) (xform #t (car inits) env))
(loop (cdr ids) (cdr inits) (cdr nids) sets lids)])))
(define (xform-begin tail env) ; non-internal
@ -491,7 +500,7 @@
(if (null? vars)
(list 'syntax (xform-body forms env))
(loop (cdr vars) (cdr exps)
(add-location (car vars)
(extend-xenv-local (car vars)
(xform #t (car exps) useenv) env))))
(x-error "invalid syntax-lambda application" use))))
(x-error "improper syntax-lambda body" (cons 'syntax-lambda tail))))
@ -529,7 +538,7 @@
(define (ellipsis? x)
(if ellipsis
(eq? x ellipsis)
(and (id? x) (ellipsis-denotation? (mac-env x)))))
(and (id? x) (ellipsis-denotation? (xenv-ref mac-env x)))))
; List-ids returns a list of the non-ellipsis ids in a
; pattern or template for which (pred? id) is true. If
@ -558,7 +567,8 @@
(cond
[(id? pat)
(if (pat-literal? pat)
(continue-if (and (id? sexp) (eq? (use-env sexp) (mac-env pat))))
(continue-if
(and (id? sexp) (eq? (xenv-ref use-env sexp) (xenv-ref mac-env pat))))
(cons (cons pat sexp) bindings))]
[(vector? pat)
(or (vector? sexp) (fail))
@ -589,7 +599,7 @@
; fresh ids, but that's okay because when we go to retrieve a
; fresh id, assq will always retrieve the first one.
(define new-literals
(map (lambda (id) (cons id (new-id (id->sym id) (mac-env id))))
(map (lambda (id) (cons id (new-id (id->sym id) (xenv-ref mac-env id))))
(list-ids tmpl #t
(lambda (id) (not (assq id top-bindings))))))
@ -1125,17 +1135,18 @@
; Environments
;---------------------------------------------------------------------------------------------
; new lookup procedure for alist-like macro environments
; new lookup procedure for explicit macro environments
(define (env-lookup id env full?) ;=> location (| #f)
(define (env-lookup id env at) ;=> location (| #f)
(if (procedure? id)
(old-den id) ; nonsymbolic ids can't be globally bound
; nonsymbolic ids can't be (re)defined
(case at [(ref set!) (old-den id)] [else #f])
(let loop ([env env])
(cond [(pair? env)
(cond [(pair? env) ; imported
(if (eq? (caar env) id)
(cdar env) ; location
(case at [(ref set!) (cdar env)] [else #f])
(loop (cdr env)))]
[(vector? env) ; root
[(vector? env) ; root (can be extended)
(let* ([n (vector-length env)] [i (immediate-hash id n)]
[al (vector-ref env i)] [p (assq id al)])
(if p (cdr p)
@ -1144,9 +1155,9 @@
(vector-set! env i (cons (cons id loc) al))
loc)))]
[(string? env) ; module prefix
(and full?
(and (memq at '(define define-syntax))
(let ([gid (string->symbol (string-append env (symbol->string id)))])
(env-lookup gid *root-environment* #t)))]
(env-lookup gid *root-environment* 'ref)))]
[else ; finite env
#f]))))
@ -1170,8 +1181,8 @@
(loop l)]
[(and (pair? v) (eq? (car v) 'syntax-rules))
(body
(define (sr-env id)
(env-lookup id *root-environment* #t))
(define (sr-env id at)
(env-lookup id *root-environment* at))
(define sr-v
(if (id? (cadr v))
(syntax-rules* sr-env (cadr v) (caddr v) (cdddr v))
@ -1179,13 +1190,8 @@
(put! k (make-location sr-v))
(loop l))])))))))
(define (root-environment id)
; new protocol for top-level envs
(if (pair? id)
(record-case id
[define (i) i]
[define-syntax (i) (env-lookup i *root-environment* #t)])
(env-lookup id *root-environment* #t)))
(define (root-environment id at)
(env-lookup id *root-environment* at))
;---------------------------------------------------------------------------------------------
@ -1210,17 +1216,18 @@
[(eq? hval 'define)
; new protocol for top-level envs
(let* ([core (xform-define (cdr x) env)]
[res (env (list 'define (cadr core)))])
(if res ; symbol (runtime store key) or #f
(compile-and-run-core-expr (list 'set! res (caddr core)))
(x-error "identifier cannot be (re)defined in env"
[loc (xenv-lookup env (cadr core) 'define)])
(if (and loc (syntax-match? '(ref *) (location-val loc)))
(compile-and-run-core-expr
(list 'set! (cadr (location-val loc)) (caddr core)))
(x-error "identifier cannot be (re)defined in env"
(cadr core) env)))]
[(eq? hval 'define-syntax)
; new protocol for top-level envs
(let* ([core (xform-define-syntax (cdr x) env)]
[res (env (list 'define-syntax (cadr core)))])
(if res ; macro location or #f
(location-set-val! res (caddr core))
[loc (xenv-lookup env (cadr core) 'define-syntax)])
(if loc ; location or #f
(location-set-val! loc (caddr core))
(x-error "identifier cannot be (re)defined as syntax in env"
(cadr core) env)))]
[(procedure? hval)

187
t.c
View file

@ -107,14 +107,19 @@ char *t_code[] = {
"P", "id->sym",
"%1.0Y0?{.0]1}.0,@(y7:old-sym)[11",
"P", "extend-xenv",
"%3.0,.3,.3,&3{%1.0,:0q?{:1]1}.0,:2[11}]3",
"P", "extend-xenv-local",
"%3.1b,.3,.1,.3,&3{%2.0,:0q?{.1,'(l2:y3:ref;y4:set!;),.1A1?{:1]3}f]3}.1"
",.1,:2[22}]4",
"P", "add-location",
"%3.1b,.1,.4,@(y11:extend-xenv)[33",
"P", "add-local-var",
"%3.2,.2,'(y3:ref),l2,.2,@(y17:extend-xenv-local)[33",
"P", "add-var",
"%3.1,'(y3:ref),l2b,.1,.4,@(y11:extend-xenv)[33",
"P", "xenv-lookup",
"%3${.4,.4,.4[02},.0?{.0]4}.3,.3,l2,'(s38:transformer: invalid identifi"
"er access),@(y6:error*)[42",
"P", "xenv-ref",
"%2'(y3:ref),.2,.2,@(y11:xenv-lookup)[23",
"P", "xform-sexp->datum",
"%1.0,,#0.0,&1{%1${.2,@(y3:id?)[01}?{.0,@(y7:id->sym)[11}.0p?{${.2d,:0^"
@ -145,8 +150,8 @@ char *t_code[] = {
"orm-call)[73",
"P", "xform-ref",
"%2${.2,.4[01},'(y3:...),.1zq?{'(s19:improper use of ...),@(y7:x-error)"
"[31}.0z]3",
"%2${.2,.4,@(y8:xenv-ref)[02},'(y3:...),.1zq?{'(s19:improper use of ..."
"),@(y7:x-error)[31}.0z]3",
"P", "xform-quote",
"%2${.2,@(y6:list1?)[01}?{${.2a,@(y17:xform-sexp->datum)[01},'(y5:quote"
@ -154,16 +159,17 @@ char *t_code[] = {
"P", "xform-set!",
"%2${.2,@(y6:list2?)[01}?{${.2a,@(y3:id?)[01}}{f}?{${.3,.3da,f,@(y5:xfo"
"rm)[03},${.3a,.5[01},${.2,@(y17:location-special?)[01}?{.1,.1sz'(l1:y5"
":begin;)]4}.0z,'(y3:ref),.1aq?{.2,.1da,'(y4:set!),l3]5}'(s27:set! to n"
"on-identifier form),@(y7:x-error)[51}.0,'(y4:set!)c,'(s18:improper set"
"! form),@(y7:x-error)[22",
"rm)[03},${'(y4:set!),.4a,.6,@(y11:xenv-lookup)[03},${.2,@(y17:location"
"-special?)[01}?{.1,.1sz'(l1:y5:begin;)]4}.0z,'(y3:ref),.1aq?{.2,.1da,'"
"(y4:set!),l3]5}'(s27:set! to non-identifier form),@(y7:x-error)[51}.0,"
"'(y4:set!)c,'(s18:improper set! form),@(y7:x-error)[22",
"P", "xform-set&",
"%2${.2,@(y6:list1?)[01}?{${.2a,.4[01},${.2,@(y17:location-special?)[01"
"}?{'(s22:set& of a non-variable),@(y7:x-error)[31}.0z,'(y3:ref),.1aq?{"
".0da,'(y4:set&),l2]4}'(s22:set& of a non-variable),@(y7:x-error)[41}.0"
",'(y4:set&)c,'(s18:improper set& form),@(y7:x-error)[22",
"%2${.2,@(y6:list1?)[01}?{${'(y4:set!),.3a,.5,@(y11:xenv-lookup)[03},${"
".2,@(y17:location-special?)[01}?{'(s22:set& of a non-variable),@(y7:x-"
"error)[31}.0z,'(y3:ref),.1aq?{.0da,'(y4:set&),l2]4}'(s22:set& of a non"
"-variable),@(y7:x-error)[41}.0,'(y4:set&)c,'(s18:improper set& form),@"
"(y7:x-error)[22",
"P", "xform-if",
"%2.0L0?{${.2,.4,&1{%1:0,.1,f,@(y5:xform)[13},@(y5:%25map1)[02},.0g,'2,"
@ -191,11 +197,11 @@ char *t_code[] = {
"P", "xform-lambda",
"%2${.2,@(y7:list1+?)[01}?{${.2a,@(y8:idslist?)[01}}{f}?{n,.2,.2a,,#0.4"
",.1,&2{%3.0p?{.0a,${${.4,@(y7:id->sym)[01},@(y6:gensym)[01},.4,.1c,${."
"6,.4,.6,@(y7:add-var)[03},.4d,:0^[53}.0u?{${.3,:1d,@(y10:xform-body)[0"
"2},.3A8,'(y6:lambda),l3]3}.0,${${.4,@(y7:id->sym)[01},@(y6:gensym)[01}"
",${.5,.3,.5,@(y7:add-var)[03},${.2,:1d,@(y10:xform-body)[02},.2,.7A8L6"
",'(y6:lambda),l3]6}.!0.0^_1[23}.0,'(y6:lambda)c,'(s20:improper lambda "
"body),@(y7:x-error)[22",
"6,.4,.6,@(y13:add-local-var)[03},.4d,:0^[53}.0u?{${.3,:1d,@(y10:xform-"
"body)[02},.3A8,'(y6:lambda),l3]3}.0,${${.4,@(y7:id->sym)[01},@(y6:gens"
"ym)[01},${.5,.3,.5,@(y13:add-local-var)[03},${.2,:1d,@(y10:xform-body)"
"[02},.2,.7A8L6,'(y6:lambda),l3]6}.!0.0^_1[23}.0,'(y6:lambda)c,'(s20:im"
"proper lambda body),@(y7:x-error)[22",
"P", "xform-lambda*",
"%2.0L0?{${.2,.4,&1{%1${.2,@(y6:list2?)[01}?{${.2a,@(y6:list2?)[01}?{.0"
@ -206,9 +212,9 @@ char *t_code[] = {
"P", "xform-letcc",
"%2${.2,@(y7:list2+?)[01}?{${.2a,@(y3:id?)[01}}{f}?{.0a,${${.4,@(y7:id-"
">sym)[01},@(y6:gensym)[01},${${.7,.5,.7,@(y7:add-var)[03},.5d,@(y10:xf"
"orm-body)[02},.1,'(y5:letcc),l3]4}.0,'(y5:letcc)c,'(s19:improper letcc"
" form),@(y7:x-error)[22",
">sym)[01},@(y6:gensym)[01},${${.7,.5,.7,@(y13:add-local-var)[03},.5d,@"
"(y10:xform-body)[02},.1,'(y5:letcc),l3]4}.0,'(y5:letcc)c,'(s19:imprope"
"r letcc form),@(y7:x-error)[22",
"P", "xform-withcc",
"%2${.2,@(y7:list2+?)[01}?{${.3,.3d,@(y10:xform-body)[02},${.4,.4a,f,@("
@ -224,18 +230,19 @@ char *t_code[] = {
"e),.1v?{${.4,@(y6:list2?)[01}?{.2au}{f}?{.2da,.6,.(i11),fc,.(i11),.3c,"
".(i11),fc,.(i11),:0^[(i12)5}${.4,@(y6:list2?)[01}?{${.4a,@(y3:id?)[01}"
"}{f}?{.2a,.3da,${${.5,@(y7:id->sym)[01},@(y6:gensym)[01},${.(i11),.3,."
"6,@(y7:add-var)[03},.9,.(i14),.3c,.(i14),.5c,.(i14),.7c,.4,:0^[(i15)5}"
"${.4,@(y7:list2+?)[01}?{.2ap?{${.4aa,@(y3:id?)[01}?{${.4ad,@(y8:idslis"
"t?)[01}}{f}}{f}}{f}?{.2aa,${'(y6:lambda)b,'(y6:lambda),@(y6:new-id)[02"
"},.4d,.5adc,.1c,${${.6,@(y7:id->sym)[01},@(y6:gensym)[01},${.(i12),.3,"
".7,@(y7:add-var)[03},.(i10),.(i15),.3c,.(i15),.5c,.(i15),.8c,.4,:0^[(i"
"16)5}.4,'(s20:improper define form),@(y7:x-error)[(i11)2}'(y13:define-"
"syntax),.1v?{${.4,@(y6:list2?)[01}?{${.4a,@(y3:id?)[01}}{f}?{.2a,.3da,"
"${.(i10),'(l1:y9:undefined;),.5,@(y12:add-location)[03},.8,.(i13),tc,."
"(i13),.4c,.(i13),.6c,.4,:0^[(i14)5}.4,'(s27:improper define-syntax for"
"m),@(y7:x-error)[(i11)2}.1K0?{.5,${.9,.8,.6[02}c,.(i10),.(i10),.(i10),"
".(i10),:0^[(i11)5}.6,.(i11),.(i11)A8,.(i11)A8,.(i11)A8,@(y12:xform-lab"
"els)[(i11)5}.0,.5,.5A8,.5A8,.5A8,@(y12:xform-labels)[55}.!0.0^_1[25",
"6,@(y13:add-local-var)[03},.9,.(i14),.3c,.(i14),.5c,.(i14),.7c,.4,:0^["
"(i15)5}${.4,@(y7:list2+?)[01}?{.2ap?{${.4aa,@(y3:id?)[01}?{${.4ad,@(y8"
":idslist?)[01}}{f}}{f}}{f}?{.2aa,${'(y6:lambda)b,'(y6:lambda),@(y6:new"
"-id)[02},.4d,.5adc,.1c,${${.6,@(y7:id->sym)[01},@(y6:gensym)[01},${.(i"
"12),.3,.7,@(y13:add-local-var)[03},.(i10),.(i15),.3c,.(i15),.5c,.(i15)"
",.8c,.4,:0^[(i16)5}.4,'(s20:improper define form),@(y7:x-error)[(i11)2"
"}'(y13:define-syntax),.1v?{${.4,@(y6:list2?)[01}?{${.4a,@(y3:id?)[01}}"
"{f}?{.2a,.3da,${.(i10),'(l1:y9:undefined;),.5,@(y17:extend-xenv-local)"
"[03},.8,.(i13),tc,.(i13),.4c,.(i13),.6c,.4,:0^[(i14)5}.4,'(s27:imprope"
"r define-syntax form),@(y7:x-error)[(i11)2}.1K0?{.5,${.9,.8,.6[02}c,.("
"i10),.(i10),.(i10),.(i10),:0^[(i11)5}.6,.(i11),.(i11)A8,.(i11)A8,.(i11"
")A8,@(y12:xform-labels)[(i11)5}.0,.5,.5A8,.5A8,.5A8,@(y12:xform-labels"
")[55}.!0.0^_1[25",
"P", "xform-labels",
"%5n,n,.4,.4,.4,,#0.0,.(i11),.(i11),&3{%5.0u?{${:0,:1,&1{%1:0,.1,f,@(y5"
@ -244,7 +251,8 @@ char *t_code[] = {
"1,.8A8,'(y6:lambda),l3,'(y4:call),@(y5:pair*)[73}.0a~?{.4,.4,${:1,.6a,"
"f,@(y5:xform)[03}c,.4d,.4d,.4d,:2^[55}.2aY0?{.4,.3ac,.4,${:1,.6a,.6a,l"
"2,@(y10:xform-set!)[02}c,.4d,.4d,.4d,:2^[55}${:1,.4a,t,@(y5:xform)[03}"
",${.3a,:1[01}sz.4,.4,.4d,.4d,.4d,:2^[55}.!0.0^_1[55",
",${'(y4:set!),.4a,:1,@(y11:xenv-lookup)[03}sz.4,.4,.4d,.4d,.4d,:2^[55}"
".!0.0^_1[55",
"P", "xform-begin",
"%2.0L0?{${.2,.4,&1{%1:0,.1,f,@(y5:xform)[13},@(y5:%25map1)[02},.0p?{.0"
@ -268,10 +276,10 @@ char *t_code[] = {
"%2${.2,@(y7:list2+?)[01}?{${.2a,@(y3:id?),@(y6:andmap)[02}}{f}?{.0d,.2"
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